SpringBoot初始教程之資料庫連線池(druid)

1.介紹

Druid是一個JDBC元件庫，包括資料庫連線池、SQL Parser等元件。DruidDataSource是最好的資料庫連線池。SpringBoot支援任何一種資料庫連結池的配置，在這裡用druid作為例子進行講解

2.快速開始

這塊先以Spring的JdbcTemplate為列子進行講解

pom.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.4.1.RELEASE</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>

        <artifactId>springboot-6</artifactId>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.39</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.26</version>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>1.4.1.RELEASE</version>
                    <configuration>
                        <fork>true</fork>
                    </configuration>
                </plugin>
            </plugins>
        </build>

    </project>
 

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配置統一的DataSource,這種方式不太合適生產環境，SpringBoot可以統一的配置application.yaml，但是目前僅僅支援dbcp、dbcp2、hikari 
下面這種方式無法不支援的DruidDataSource的其他引數

application.yaml

    spring:
      datasource:
        driver-class-name: com.mysql.jdbc.Driver
        username: root
        password: qq123456
        url: jdbc:mysql://localhost:3306/test1
        type: com.alibaba.druid.pool.DruidDataSource
 

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通過程式碼的方式進行配置

    @SpringBootApplication
    public class AppApplication {

        public static void main(String[] args) throws Exception {
            SpringApplication.run(AppApplication.class, args);
        }

        /**
         * 註冊DruidServlet
         *
         * @return
         */
        @Bean
        public ServletRegistrationBean druidServletRegistrationBean() {
            ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
            servletRegistrationBean.setServlet(new StatViewServlet());
            servletRegistrationBean.addUrlMappings("/druid/*");
            return servletRegistrationBean;
        }

        /**
         * 註冊DruidFilter攔截
         *
         * @return
         */
        @Bean
        public FilterRegistrationBean duridFilterRegistrationBean() {
            FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
            filterRegistrationBean.setFilter(new WebStatFilter());
            Map<String, String> initParams = new HashMap<String, String>();
            //設定忽略請求
            initParams.put("exclusions", "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*");
            filterRegistrationBean.setInitParameters(initParams);
            filterRegistrationBean.addUrlPatterns("/*");
            return filterRegistrationBean;
        }

        /**
         * 配置DataSource
         * @return
         * @throws SQLException
         */
        @Bean
        public DataSource druidDataSource() throws SQLException {
            DruidDataSource druidDataSource = new DruidDataSource();
            druidDataSource.setUsername("root");
            druidDataSource.setPassword("qq123456");
            druidDataSource.setUrl("jdbc:mysql://localhost:3306/test1");
            druidDataSource.setMaxActive(100);
            druidDataSource.setFilters("stat,wall");
            druidDataSource.setInitialSize(10);
            return druidDataSource;
        }

    }

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這塊採用的是ServletRegistrationBean 和FilterRegistrationBean的方式進行註冊Servlet和Filter，這種是SpingBoot裡面提供支援原生的方式 
除了這種方式還可以採用其他方式進行配置，採用Servlet3.0的註解Servlet進行配置

這塊配置基本就完事了，可以訪問本地連結http://localhost:8080/druid/datasource.html檢視監控資訊

官方資料

其他的詳細配置可以檢視官方文件進行配置，這裡不過多講述 
https://github.com/alibaba/druid/wiki/%E9%A6%96%E9%A1%B5